The capulets and the Montagues have caused troubles for the prince before.

I can't find a line in the book to help me prove this.

Someone help me find it?

Try this useful site.

http://nfs.sparknotes.com/romeojuliet/

Romeo & Juliet:

Act I, Scene I, the Prince says: By thee, old Capulet, and Montague,
Have thrice disturb'd the quiet of our streets,

Sra

To find evidence that supports the statement about the Capulets and Montagues causing troubles for the prince, you can follow these steps:

1. Identify the book you are referring to. For example, if you are referring to William Shakespeare's play "Romeo and Juliet," specify that.

2. Look for specific scenes or incidents involving the Capulets and Montagues that may have caused troubles for the prince or the ruling authority. Pay attention to any dialogue, actions, or events that suggest conflicts between the two families and the prince.

3. To assist in your search, consider using digital resources such as e-books, online versions of the text, or searchable databases. These platforms often have search functions that allow you to find specific keywords or phrases within the text.

4. Use keywords such as "prince," "Capulets," "Montagues," or any other related terms to search within the text. For instance, you could search for phrases like "troubles caused by Capulets and Montagues," "prince's conflicts with the two families," or similar variations.

5. Skim through the search results or use the "Find" function to locate relevant passages. Read the context surrounding those passages carefully to ensure they address the troubles caused by the Capulets and Montagues for the prince.

Remember, the process of finding evidence can vary depending on the specific edition or translation of the book you are using. Additionally, it's essential to critically analyze the selected passages to ensure they convincingly support the statement in question.